brown-



(No Model.) 5 Sheets-Sheet. 1.

H. P. BROWN. ORB ROASTING FURNACE.

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amen wi e c (No Model.) 5 Sheets-Sheet 2.

H. P. BROWN.

ORE ROASTING FURNACE.

PatentedJan. 3, 1893.

(No Model.) 4 w 5 Shets-Sheet a.

H. P. BROWN... ORE ROASTING FURNACE.

PatentdJan. 3, 1893.

MM J (No Model'.) 5 Sheets-Sheet 5.

H. F. BROWN.

ORE ROASTING FURNACE.

No. 489.143. Patented Jan. 3, 1893.

5 the fire box, so that the saxnemay be drawn "spective view-of the doors.

UN TED STATES Homes r.

nnownpo'r BUTTE, Mo N Ann,- AssIeNon irof ua or CHICAGO, ILLINOIS} iii? c1 shown oRE-RoAsTiNe FURNACE.

SPECIFICATION To all whom it may concern.-

Be it known that Lilonaon F. BROWN,a citizen of the United States, residing at Butte, in the county of Silver Bow and State of Mon tana, ha e invented certain new and useful Improvements in Orb-Roasting Furnaces, as set forth in the accompanyingdrawings, forming partof this specification, in which- Figurel, is a longitudinal sectional view on the line a-a of,Fig.2 showing one end-of the furnace. Fig. 2, is a cross sectional view of the same on the line ?)--b of Fig. 1. Fig. 3, is a longitudinal sectional view of one end of the f urnaceshowing a means for storing the calcinedor'e's in connection with the fine from off in charges and transported to the reducing furnaces while in a heated condition. Fig. 4, is a sectional view showing one of the doors at the ends of the" furnace. Fig. 5, is a per- D Fig. 6, is a transverse sectional viewtaken through one of the supplemental chambers at the sides of the mainroasting hearth and showing the con-. struction of the wall or partition which forms said chamber. Fig. 7, is a longitudinal sectional view of the same. Figs. 8, .3, and 1-0 are details of said wall or partition. Fig. -11,is a transverse sectional view through the, supplemental side compartment orchamber showing one of the chain supporting. rollers, the track rails, and means for securing the same. Fig. 12, is a perspective view of the rails, with their supporting chair and adjunctive parts. Fig. 13, is a longitudinal sectional view througha portion of the furnace showing the construction of the wall or'partition between the upper andlower hearths. Fig. 14, is a transverse sectional view ot-the same on the line c-c of Fig. 13.' Fig. 15, is a detailshow-' ing in perspective the rods Fahd connections.

My invention relates to ore roasting furnaces generally, and particularly to that class having upper and lower horizontal coinpartincnts forming the main roasting hearths, connected one with the other, and employing carriages provided with means for advancing and stirring the ore. It is an improvement g on my former patent No. 402,619 granted to 5 me March 22, 1892, and on the application filed by me December 8, 1891, Serial No. 414;,359.

forming part efjLetters rarest No. 439,143, dated. ung- 3, 1893;" Application filed April 11, 1.892- Serial lilo-428,749. (No model.) V

' The object of my invention is'to improve the furnaces describedand shown in said pat cut and former application, especially as to the details of the same, and therefore niy-invention consists of the constructions and combinations of the devices which I shall hereinafter fully describe and claim.

To enable others skilled in the art to which my inventionappertains to make and use the same, I will now describe its construction and indicate the manner in which the SHIIIGlS carried out. p

In the proper treatmentof ores, it is advam tageons and even necessary'to mix various kinds of ores together to obtain a-proper combination for iiuxingf' In ores carrying a high per cent. of. sulphur, such as sulphides of iron and copper, a considerable time is necessary for burning off the excess of sulphur;

to do this the ore is slowly moved the entire length of two hearths of the furnaces, and by being so frequently stirred and exposed'to the heat and oxygen, the sulphur is practically eliminated. For-[the economical after treatment of this ore, itlis necessary to add a very silieious ore carrying little or no sulphur. It this latter ore should be fed in with the sulphide ores through the hopper o'r feederit would necessitate the moving and 8e W The furnace, herein shown is constructed of the usual materials, and is made with two separate hearth's'A and B one located over the other, and connected therewith by means of an opening as usual whereby the ore is dis- 0 charged f'roni the upper compartment or hearth to the lower, and is finally conveyed to thecooling floors in the usual manner.

In order that the siliciousores may be introduced at the proper point, I let into the 5 wall or partition between the two hearths a transverse pipe A within which is suitably journaled a screw conveyor B of any desired form, and connect one endof the p'ipeA with the discharge chute of a hopper A which leads through the roof or arch of the hearth whereby the ore delivered from said hopper of suitable deals.

-.the furnace for melting.

1s advanced by the screw con veycr toward the center of the roasting hearth, and is discharged through a chute or spout, as for instance the double or bifurcated spout B let through the-arch or roof of the lower hearth, and is discharged onto the said hearth in sufficient quantities to form the exact proportion needed tor a proper and'successful smelting harge, and where it becomes heated and thoroughly mixed with the roasting ores. It

is obvious that fine dust andother substances may likewlse be iutrodu'cedfas also salt for chloridizing purposes. a

In; order that the ores may be properly stored, afiterbeing roasted and mixed, until needed for being ch trged intothe matting or fusing furnace, I e ploy the means shown in Fig. 3, in which 0 represents a hopper constructed preferably within the end walls of the furnace and immediately under the inletarch'from the first fire boxes. The ore is dis charged into this hopper by means otfthe carrlagcs F, which'are provided with suitable stirrers, and are operated by means ot'th-e endless chains G passing over end pulleysor drums H n the manner described'and claimed n my said former patent.

The ore at a red heat, is fedin'to the hopper work the ore in charges, a feature especially desirable in the matting or fusing furnaces, and also .enables meto work the ore while in a heated condition,- which saves time and ex-' pense of reheating. I r To prevent a too free influx of outside air -1nto the roasting chambers, and the subsequent cooling of the furnace, it is necessary to close the two ends of the iiearths by means One form of these doors is fully disclosed in my said former patent, and a new and very desirable form is shown in Figsl 4 and 5 of the accompanying drawings.

In said figures a transverse rod l is journaled across the ends of the furnace, and upon this red the'sheet metal doors D and D are hung, said doors D closing the ends of thehearths, while the doors i) close the ends of the supplemental chambers along the sides of the rmainclhambers. The doors D are actuated by means of the wheels of the carriages-F contacting with them as the carriages enter or leave the furnace, while to the doors Dare secured the inclined outwardly extending arms I) which are designed to be engaged by the projecting hub of the plows or carriages, which latter lift the doors D as the carriages pass until they clear the stirrers D on said carriages, as shown in Fig. 4.

One of the essential features of my patent No. 402,619 before mentioned,was the formation of a vertical wall or partition along the sides of the hearths, to form supplemental.

chambers in which the carriages and operatting chains or cables were located, so that they were cutoff from the direct action of the heat, fumes and gases arising from the ore,

In Figs, 6 to .10 inclusive, Iillus'trate an i improved form of'wall or partition, which has been found .to bevery beneficial and of simple construction. This improved wall or partition E is-formed of firebrickor other re= tractor-y material-and consists of a lower portion e which is built in the door of the fur= nace, and. an upper portion 6' which depends tromthe root but-terminates short of the lower portion to form anarrow slot or opening between the two portions'for the stirrer arms of the wheeled carriages to project through. In order that the upper portion 6 of the wall or partition may be suitably supported and removably attached, I em ploy a construction substantially like that shown in said Figs. 6 to 1O inclusive, and in which the upper portioni'ot the wall or partition has a sheet metal backing g which supports-the entire upper section of the wall on the back, and is bent up under its lower edge and along the front face a short distance toform a secure seat for said section. To the rear face of this backingg are secured hangers E having slotted heads orjawsh at their upper ends, while in the archer roof contiguousto. said wall is a slotted oar F see Figs. 10 and 10,- Suitable bolts Z and Z have their inner e'nds provided with heads fitted in the slotted bar F, the

said bolts Zextending downward'through the slotted jaws -h and provided with note by which they secure the'upper section of the wall E in position, while the other bolts Z we tend upwardly throughthe arch or roof and are-also provided with nuts. This construction enables me to form a'rigid and solid wall the whole length of the'furnace, while the pe- Yculiar hanging of the upper section 6 from the slottsd'bar' also enables me to remove the'section by loosening the nuts on the-rods land sliding the section endwise out of the furnace. To prevent the upper section of the wall or partition from becoinin g displaced by the shifting of the arch due to the action of the heat, a row of bricks F in said arch is laid so as to project from the inner face of the arch contiguous to the section eto form aguard the entire length-of the furnace in front of the wall.

from working forward, which, owing to its ans gular shape at the top, it is liable to do shouid the action of the heat in any degree loosen its fastenin s. The han er E is also rovidedl b b with a lug or projection E fitting an opening in the upper section 9 of the wall or partition, and thereby suspending the same from the hanger.

In in y said former patent, lhave illustrated This construetion also prevents the hangers E and the upper section e" endless chains W pass.- In these figures G in ,dicates a suitable chair having recesses 12 formed near theeuds for receiving the flanges to o'f-the rails. Clips G confined in place between the flanges of the chair, engage the opposite sides of the rail flanges and are held in position against said flanges and against studs Cl rising from the floor, by means of pins or spikes G whereby a solid support is given the rail. To form a support for the'small chaincarrier wheel G the standards G arec'ast or otherwise secured to the middle'portion of the chair, and their upper ends form a box or bearing in which the shaft or journal of the .wheel G 'is mounted. The chair is placed between the walls of the furnace H, and the lower section of the wallor diaphragm E and upon being keyed in. place forms a rigid sup-.-

port for the track as well as the wall itself.

.In the character of furnaces described halvin two or more hcarths one above the other, it as been found by experience that the difficulty'of keeping up'the horizontal wall or 0- partition between two hearths-was a serious objection. Owing to its great weight, as well as to the fact that it was heated from above and below, the pressure on the side walls was enormous and very diificulhtocontrol. To 3 5 more nearly equalize the strain'aud prevent this lateral pressure on the walls of the furnace, I have adopted the construction shown in Figs. 13, 14 and '15, wherein I represents an arch formed laterally across the furnace, and l is a series of cross arches having their thrust at right angles thereto, or longitudinal ofthe furnace. Skew-backs for these arches are formed, preferably. by means of. two T- rails I located between the ends of the arches ,5 with their heads in contact as shown in Fig. 13. .From these skew-backsthe arches are sprung, while the spaces between the arches form passages extending through the sides of the furnace and providing for a free circu- 5o lation of air. The brick work of the arches is so arranged asto leave a hollow space entirely across the furnace, to admit of a free circulation of air to keep the skew-backs themselves cool, while the ends of the'skew; 5 5 backs are provided with rods I having threaded outer ends (see Fig. 15) arranged to clamp the buck-stay 1 thereby making the T-rails serve both as skew-backs and as the clamping rods for bolting the furnace together. The skewbacks may be formed of brick or tiling and the clamping rods so put in as. to pass across the furnace though the hollow formed by the arc1-.es,'butl prefer-the construction noted above, wherein the skew" 5 5 backs are formed by ails, as they will carry all the weights of the hearth, and relieve the walls entirely of this lateral pressure.

Having t h us described my invention what lclailn as new and desire to secure by Letters Patent, isz- I 1. In an ore roasting furnace the roasting hearths thereof located one above the other, and a conveyer extending transversely through the horizontal wall or partition between said hearths and leading to the outside of the furnace; said wall or partition having an opening through which the material is fed.

by the conveyor to the roasting hearth to be mixed with the ore thereon.

2. In an orc roasting furnace, the roasting hearths arranged one above the other a tube extending transversely through the horizontal wall or partition between the hearths, and a chute or spout leading therefrom through the arch or roof, in combination with a screw conveyer and actuating mechanism within said tube for feeding material to the chute or spout whereby it is deposited upon the roasting hearthto be mixed with the ore thereon.

- 3. In an ore roasting furnace having roasting Martha-located one above the other the combination of a tube extending transversely through the horizontal wall or partition be tween the hearths, a feed hopper commumeating with the tube,a screw conveyor in said.

tube, and a. chute or spout extending downwardly from the tube through the arch or root for directing material uponthc hearth to be mixed with the ore thereon.

4. In an ore roasting furnace having roasting hearths one above the'other,-and hav ng fire boxes with flucs communicating with said heal-tbs, the combination of means for advancing and stirring the ore, a hopper or receiver within the end walls of the furnace below the plane of the lower roastingheart-h, and immediately under the inlet arch from one of the fire boxes whereby theme is collected in charges and maintained in a heated condition, substantially as herein described.

5. In an ore roasting furnaoe,having a roastin g hearth with supplemental chambers along its sides, the walls orpartitions forming said chambers, and each comprising a lower sec- -tion rising from the floor of the hearth, and

an upper section depending from thcarchor roof, a slotted bar in said arch or roof, aud otermediate devices whereby the upper section is suspended from said bar; g

6. In an ore roasting furnace having mam roasting liearths, the walls orp'artitions along the sides thereof forming-supplemental chambers, said walls comprising lower and. upper sections of tiling, a metal backing for the upper section, the metal hangers E secured thereto having the slotted jaws h and lug or projection E, a slotted bar located in the arch or roof, and bolts fitted to said bar andhang ers and suspending the upper section, substantially as herein described,

too

7. In an orc roasting furnace, at twcrpert wall or partition extending along'the sides of the main roasting hearths to form supple'mem ta-l side compartment-s, means for suspending 4 7 seems the upper section or the wall from the arch or root of the hearth, and a projection F from the arch or roof contiguous to the upper sec.- tion of the wall to form a guard and prevent displacement of said section, substantially as herein described.

S. In an ore roasting furnace having main roasting compartments and suppieneental compartments along the sides thereof, the pivotally hung doors D and D at the ends of said main and supplemental compartments,

said doors D having theinciined arms I) and wheeled carriages to engage said arms and open the doors, said carriages being provided with means for stirring the ore, substantially as herein described. r

9. In an ore roastingfurnace having" roasting hearths, the'wallor partition E therein consisting of an upper-and lower section a metal backing for the upper section turned up at its bottom to form a seat therefor the hangersE provided with the slotted jaws h, anda lug or projection E cute. ing said section, and means for suspending said section from the arch or roof. substantially as herein described.

10. In an ore roasting furnace having a roasting hearth, the two-part wall or partition extending along the sides thereof to form supplemental compartments, themetal chair in said side compartments and bracing the lower section of the wall or diaphragm, track rails mountedon said chair, the clips secured against said r ils and against stops or-lugs G3 on the'chair-for securing the rails in position, and'a pulley mounted within the central portion of the chair and supporting the weight of the chains which carry the stirring devices, substantially as herein described. i

11. In an ore roasting furnace hav1ng side compartments, endless chains, and carriages hailing stirring'devicesand adaptedtotravei in said compartments, the metal chairs in said cqmpartments havingthe standards G the pulley G mounted in said standards and supportingthe endless chains, and track ra ls on said chair, substantially as here1n described.

12.- In'an ore roasting furnace hav ng upper and lower chambers with-arched tops, the wall or partition between said chambers formed of arches extending in series in the direction or the length of the furnace, and transverse of the arches of said .chainbers.

13. in an ore roasting furnace having upper and lower chambers, with arched tops the Wall or partition between said chanibers formed of arches extending in series in the direction of the length-of the furnace and at right angles with the arches of the chambers and 'T-rails between the adjoining ends 01 the series of arches.

14:. .In an ore roasting furnace hav ng upper and lower chambers, with arched tops the wall or partition between the chambers formed ot-a series of arches arranged transversely of the main. arches of the chambers, said series of arches having passagesbetween their ends leading through the sides'of the furnace, substantially as herein described.

HORACE F. BROWN.

. W'itnesses:

Grno. K. FISCHER, BEN H. Wrnson 

